Five months after Tesla announced a more than $2 billion bid to acquire SolarCity, shareholders of both companies voted in favor of the deal today.

“The transaction will be completed in the coming days,” Tesla said on its blog this evening.

While Tesla will continue making electric cars and home battery systems, CEO Elon Musk says Tesla’s purpose is broader: to “accelerate the world’s transition to sustainable energy.”

Musk pitched this vision to shareholders three weeks ago when he unveiled the two companies’ first collaboration: a solar roof — which, Musk has previously said, is “not a thing on the roof,” like traditional, roof-mounted solar panels. “It is the roof.”